煤矿安全2025，Vol.56Issue(3)：137-147,11.DOI:10.13347/j.cnki.mkaq.20231481
胶结充填体动载破坏力学特征研究
Study on mechanical characteristics of cemented backfill under dynamic load
摘要
Abstract
To study the mechanical characteristics of cemented backfill with different batching ratio and mass fraction conditions un-der impact loading,a 50 mm rod diameter split Hopkinson pressure bar test device was used to carry out impact loading tests on the cemented backfill,and at the same time,according to the results of the SHPB experiments,the damage process of the cemented back-fill and coal rock affected by the impact pressure in the underground backfill mining was simulated with the help of Holmquist-John-son-Cook(HJC)model.The results show that the dynamic compressive strength of cemented backfill shows a good strain rate effect.In the lower strain rate range(46.21-79.85 s-1),the higher the coarse aggregate content,the lower the peak stress,and the maximum strength of the filling body decreased by 87.94%;in the higher strain rate range(145.01-197.48 s-1),the peak stress increases obvi-ously with the increase of coarse aggregate content,and the strength of backfill increases by 53.56%;the increase of mass fraction and gray-sand ratio has a significant strengthening effect on the strain rate effect of compressive strength.The increase of mass frac-tion and ash-sand ratio makes the dissipation rate of the cemented backfill specimen show a tendency to increase;the numerical sim-ulation results of SHPB are in good agreement with the experimental results,and the simulation results of impact ground pressure verified that the cemented backfill has a certain protective effect on the coal rock mining in the backfill mining.关键词
煤矸石基充填体/充填开采/冲击地压/应变率效应/动态抗压强度Key words
coal gangue base filling body/backfill mining/rock burst/strain rate effect/dynamic compressive strength分类
矿山工程引用本文复制引用
解北京,李晓旭,梁天宇,陈铭进,陈思羽,吴飞岐..胶结充填体动载破坏力学特征研究[J].煤矿安全,2025,56(3):137-147,11.基金项目
国家重点研发计划资助项目(2022YFC2904100) （2022YFC2904100）
中央高校基本科研业务费专项资金资助项目(2023ZKPYAQ04) （2023ZKPYAQ04）
安徽省爆破器材与技术工程实验室资助项目(AHBP2022A-03) （AHBP2022A-03）
